What does the show ip route command display?

The show ip route command is used in Cisco routers to display the routing table. The routing table contains information about the paths that the router uses to forward packets to different networks. This includes a list of known networks, the associated subnet masks, the next-hop addresses, and the route metrics, which signify how "good" or "efficient" each route is based on factors such as hop count or bandwidth.

When a router processes incoming data, it refers to the routing table to determine the best path for forwarding packets towards their destination. This command is critical for network administrators to understand the existing routes in the network, diagnose connectivity issues, and optimize routing paths.

The other options relate to different sets of information that are not provided by the show ip route command. For instance, details about interfaces, VLAN configurations, and installed IOS versions involve different commands altogether and do not pertain to routing information. Thus, the correct response highlights the specific function of the command in relation to the router's operation in managing data flow across the network.